Patent GB-509051-A (GB)
Title: Improvements in or relating to means for use in discharging liquid from milking machines or from liquid handling apparatus functioning as a metering or weighing device
IPC: A01J5/01
Filed: 1938-01-14
Abstract: 509,051. Fluid-actuated valves. TURNER, Ltd., S., and PLINT, A. F. Jan. 14, 1938, No. 1316. [Class 135] [Also in Groups I and XVIII] Apparatus for discharging liquids from under vacuum comprises a releaser 3, suspended from a steelyard beam 20 to which the liquid passes for discharge from a fixed liquid receiver 2, the beam 20 having a weight 22 reciprocating thereon and being oscillated by variation in the weight of liquid in the releaser 3, the oscillation simultaneously operating valve mechanism which controls the pressure on the releaser 3 for filling and discharge respectively, the reciprocation of the weights controlling the oscillation of the beam to provide higher volumetric efficiency in the apparatus. The apparatus may be employed in cow-milking machines or in machinery acting as a metering or weighing device for liquids. In one form as applied to a cow-milker, the milk is supplied from the teat cups through a pipe 1, Fig. 1, to a receiver 2 which is under constant vacuum through a vacuum pipe 7 which is also connected through a port 9 to a valve seating 8 which is connected through a port 10 with the atmosphere. In the seating 8 works a piston valve 11 having discs 12, 13 and connected by a lever 15 with the steelyard beam 20 which causes it to reciprocate, thus relating releaser 3 through a flexible pipe 27 alternately to vacuum, on which it is charged with milk from the receiver 2 through a flexible coupling 4 and a non-return valve 5, and to atmosphere on which it is discharged through non-return valve 6. The releaser 3 is suspended from the beam 20 by a rod 21 which has a knife edge engaging a groove 18 on the beam. The beam 20 is supported on a pivot 19 and has a balance weight 16 which can be varied. A rolling weight 22 moves over a track between shoulders 23, 24 on the beam, inclines 25, 26 ensuring immediate movement of the roller for a small movement of the beam. A slack joint is provided between valve 11. and lever 15 so that the beam has moved to about its mid-position before the valve moves to cut off port 14 of pipe 27 from port 9 and relate it to atmosphere for discharge of releaser 3. As the roller 22 has much reduced leverage when up against stop 23, the milk has time to run out of releaser 3 before reverse movement of the beam begins. In a modification, the releaser 29 is connected by flexible pipe 34 to the valve seating 8 in which is reciprocated by connection through lever 15 to the beam 20, a piston 31 carrying a disc 32 which connects pipe 34 alternately to the atmosphere and through pipe 30 to vacuum pipe 7. The beam 20 is pivoted on a knife edge 36 and the releaser 29 is supported therefrom by a link 28. The releaser 29 is connected to the receiver through a flexible sleeve 38, a positively acting valve 37 and pipes 4, 4<1>, the valve 37 being brought to bear against the end of pipe 4<1> to cut off the supply. In modified forms, the operation of the valve for controlling the pressure in the releaser may be effected by pneumatic valves or by electricity by means of suitable contacts and relays. Specification 453,895, [Group I], is referred to. The Provisional Specification refers to Specification 324,140, [Class 84].